Sakura-chan, a girl who runs away from home on a Friday night due to her boyfriend's repeated cheating. Her female friend, who she relied on, was not caught, so she decided to stay at her close male friend's house as a last resort. However, the friend she thought was harmless is actually a terrible sadist!? Taking advantage of her weakness, her unexpected male friend develops her sexual sensitivity, and she eventually becomes a masochistic sex slave...